1# 2# Copyright (c) 2022-2025, Arm Limited. All rights reserved. 3# 4# SPDX-License-Identifier: BSD-3-Clause 5# 6 7# This file lists all of the architectural features, and initializes 8# and enables them based on the configured architecture version. 9 10# This file follows the following format: 11# - Enable mandatory feature if not updated, as applicable to an Arch Version. 12# - By default disable any mandatory features if they have not been defined yet. 13# - Disable or enable any optional feature this would be enabled/disabled if needed by platform. 14 15# 16################################################################################ 17# Enable Mandatory features if not updated yet, based on Arch versions. 18################################################################################ 19# 20 21# Enable the features which are mandatory from ARCH version 8.1 and upwards. 22ifeq "8.1" "$(word 1, $(sort 8.1 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 23armv8-1-a-feats := ENABLE_FEAT_PAN ENABLE_FEAT_VHE 24 25FEAT_LIST := ${armv8-1-a-feats} 26endif 27 28# Enable the features which are mandatory from ARCH version 8.2 and upwards. 29ifeq "8.2" "$(word 1, $(sort 8.2 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 30armv8-2-a-feats := ENABLE_FEAT_RAS 31# 8.1 Compliant 32armv8-2-a-feats += ${armv8-1-a-feats} 33 34FEAT_LIST := ${armv8-2-a-feats} 35endif 36 37# Enable the features which are mandatory from ARCH version 8.3 and upwards. 38ifeq "8.3" "$(word 1, $(sort 8.3 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 39# 8.2 Compliant 40armv8-3-a-feats += ${armv8-2-a-feats} 41 42FEAT_LIST := ${armv8-3-a-feats} 43endif 44 45# Enable the features which are mandatory from ARCH version 8.4 and upwards. 46ifeq "8.4" "$(word 1, $(sort 8.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 47armv8-4-a-feats := ENABLE_FEAT_SEL2 ENABLE_TRF_FOR_NS ENABLE_FEAT_DIT 48# 8.3 Compliant 49armv8-4-a-feats += ${armv8-3-a-feats} 50 51FEAT_LIST := ${armv8-4-a-feats} 52endif 53 54# Enable the features which are mandatory from ARCH version 8.5 and upwards. 55ifeq "8.5" "$(word 1, $(sort 8.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 56armv8-5-a-feats := ENABLE_FEAT_RNG ENABLE_FEAT_SB 57# 8.4 Compliant 58armv8-5-a-feats += ${armv8-4-a-feats} 59 60FEAT_LIST := ${armv8-5-a-feats} 61endif 62 63# Enable the features which are mandatory from ARCH version 8.6 and upwards. 64ifeq "8.6" "$(word 1, $(sort 8.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 65armv8-6-a-feats := ENABLE_FEAT_ECV ENABLE_FEAT_FGT 66# 8.5 Compliant 67armv8-6-a-feats += ${armv8-5-a-feats} 68FEAT_LIST := ${armv8-6-a-feats} 69endif 70 71# Enable the features which are mandatory from ARCH version 8.7 and upwards. 72ifeq "8.7" "$(word 1, $(sort 8.7 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 73armv8-7-a-feats := ENABLE_FEAT_HCX 74# 8.6 Compliant 75armv8-7-a-feats += ${armv8-6-a-feats} 76FEAT_LIST := ${armv8-7-a-feats} 77endif 78 79# Enable the features which are mandatory from ARCH version 8.8 and upwards. 80ifeq "8.8" "$(word 1, $(sort 8.8 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 81armv8-8-a-feats := ENABLE_FEAT_MOPS 82# 8.7 Compliant 83armv8-8-a-feats += ${armv8-7-a-feats} 84FEAT_LIST := ${armv8-8-a-feats} 85endif 86 87# Enable the features which are mandatory from ARCH version 8.9 and upwards. 88ifeq "8.9" "$(word 1, $(sort 8.9 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 89armv8-9-a-feats := ENABLE_FEAT_TCR2 ENABLE_FEAT_DEBUGV8P9 \ 90 ENABLE_FEAT_SCTLR2 ENABLE_FEAT_CLRBHB 91# 8.8 Compliant 92armv8-9-a-feats += ${armv8-8-a-feats} 93FEAT_LIST := ${armv8-9-a-feats} 94endif 95 96# Enable the features which are mandatory from ARCH version 9.0 and upwards. 97ifeq "9.0" "$(word 1, $(sort 9.0 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 98# 8.5 Compliant 99armv9-0-a-feats += ${armv8-5-a-feats} 100FEAT_LIST := ${armv9-0-a-feats} 101endif 102 103# Enable the features which are mandatory from ARCH version 9.1 and upwards. 104ifeq "9.1" "$(word 1, $(sort 9.1 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 105# 8.6 and 9.0 Compliant 106armv9-1-a-feats += ${armv8-6-a-feats} ${armv9-0-a-feats} 107FEAT_LIST := ${armv9-1-a-feats} 108endif 109 110# Enable the features which are mandatory from ARCH version 9.2 and upwards. 111ifeq "9.2" "$(word 1, $(sort 9.2 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 112# 8.7 and 9.1 Compliant 113armv9-2-a-feats += ${armv8-7-a-feats} ${armv9-1-a-feats} 114FEAT_LIST := ${armv9-2-a-feats} 115endif 116 117# Enable the features which are mandatory from ARCH version 9.3 and upwards. 118ifeq "9.3" "$(word 1, $(sort 9.3 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 119# 8.8 and 9.2 Compliant 120armv9-3-a-feats += ${armv8-8-a-feats} ${armv9-2-a-feats} 121FEAT_LIST := ${armv9-3-a-feats} 122endif 123 124# Enable the features which are mandatory from ARCH version 9.4 and upwards. 125ifeq "9.4" "$(word 1, $(sort 9.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 126# 8.9 and 9.3 Compliant 127armv9-4-a-feats += ${armv8-9-a-feats} ${armv9-3-a-feats} 128FEAT_LIST := ${armv9-4-a-feats} 129endif 130 131# Enable the features which are mandatory from ARCH version 9.5 and upwards. 132ifeq "9.5" "$(word 1, $(sort 9.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 133# 9.4 Compliant 134armv9-5-a-feats += ${armv9-4-a-feats} 135FEAT_LIST := ${armv9-5-a-feats} 136endif 137 138# Enable the features which are mandatory from ARCH version 9.6 and upwards. 139ifeq "9.6" "$(word 1, $(sort 9.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 140# 9.5 Compliant 141armv9-6-a-feats := ENABLE_FEAT_UINJ 142armv9-6-a-feats += ${armv9-5-a-feats} 143FEAT_LIST := ${armv9-6-a-feats} 144endif 145 146# Set all FEAT_* in FEAT_LIST to '1' if they are not yet defined or set 147# from build commandline options or platform makefile. 148$(eval $(call default_ones, ${sort ${FEAT_LIST}})) 149 150# 151################################################################################ 152# Set mandatory features by default to zero, if they are not already updated. 153################################################################################ 154# 155 156# Flag to enable the spinlock implementation variant using the FEAT_LSE 157# compare-and-swap instruction. 158USE_SPINLOCK_CAS ?= 0 159 160#---- 161# 8.1 162#---- 163 164# Flag to enable access to Privileged Access Never bit of PSTATE. 165ENABLE_FEAT_PAN ?= 0 166 167# Flag to enable Virtualization Host Extensions. 168ENABLE_FEAT_VHE ?= 0 169 170#---- 171# 8.2 172#---- 173 174# Enable RAS Support. 175ENABLE_FEAT_RAS ?= 0 176 177#---- 178# 8.3 179#---- 180 181# Flag to enable Pointer Authentication. Internal flag not meant for 182# direct setting. Use BRANCH_PROTECTION to enable PAUTH. 183ENABLE_PAUTH ?= 0 184 185# FEAT_PAUTH_LR is an optional architectural feature, so this flag must be set 186# manually in addition to the BRANCH_PROTECTION flag which is used for other 187# branch protection and pointer authentication features. 188ENABLE_FEAT_PAUTH_LR ?= 0 189 190# Include pointer authentication (ARMv8.3-PAuth) registers in cpu context. This 191# must be set to 1 if the platform wants to use this feature in the Secure 192# world. It is not necessary for use in the Non-secure world. 193CTX_INCLUDE_PAUTH_REGS ?= 0 194 195 196#---- 197# 8.4 198#---- 199 200# Flag to enable Secure EL-2 feature. 201ENABLE_FEAT_SEL2 ?= 0 202 203# By default, disable trace filter control register access to lower non-secure 204# exception levels, i.e. NS-EL2, or NS-EL1 if NS-EL2 is implemented, but 205# trace filter control register access is unused if FEAT_TRF is implemented. 206ENABLE_TRF_FOR_NS ?= 0 207 208# Flag to enable Data Independent Timing instructions. 209ENABLE_FEAT_DIT ?= 0 210 211#---- 212# 8.5 213#---- 214 215# Flag to enable Branch Target Identification. 216# Internal flag not meant for direct setting. 217# Use BRANCH_PROTECTION to enable BTI. 218ENABLE_BTI ?= 0 219 220# Flag to enable access to the Random Number Generator registers. 221ENABLE_FEAT_RNG ?= 0 222 223# Flag to enable Speculation Barrier Instruction. 224ENABLE_FEAT_SB ?= 0 225 226#---- 227# 8.6 228#---- 229 230# Flag to enable access to the CNTPOFF_EL2 register. 231ENABLE_FEAT_ECV ?= 0 232 233# Flag to enable access to the HDFGRTR_EL2 register. 234ENABLE_FEAT_FGT ?= 0 235 236#---- 237# 8.7 238#---- 239 240# Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn. 241ENABLE_FEAT_HCX ?= 0 242 243#---- 244# 8.8 245#---- 246 247# Flag to enable FEAT_MOPS (Standardization of Memory operations) 248# when INIT_UNUSED_NS_EL2 = 1 249ENABLE_FEAT_MOPS ?= 0 250 251#---- 252# 8.9 253#---- 254 255# Flag to enable access to TCR2 (FEAT_TCR2). 256ENABLE_FEAT_TCR2 ?= 0 257 258# Flag to enable access to SCTLR2 (FEAT_SCTLR2). 259ENABLE_FEAT_SCTLR2 ?= 0 260 261# 262################################################################################ 263# Optional Features defaulted to 0 or 2, if they are not enabled from 264# build option. Can also be disabled or enabled by platform if needed. 265################################################################################ 266# 267 268#---- 269# 8.0 270#---- 271 272# Flag to enable support for clrbhb instruction. 273ENABLE_FEAT_CLRBHB ?= 0 274 275# Flag to enable CSV2_2 extension. 276ENABLE_FEAT_CSV2_2 ?= 0 277 278# Flag to enable CSV2_3 extension. FEAT_CSV2_3 enables access to the 279# SCXTNUM_ELx register. 280ENABLE_FEAT_CSV2_3 ?= 0 281 282# By default, disable access of trace system registers from NS lower 283# ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused if 284# system register trace is implemented. This feature is available if 285# trace unit such as ETMv4.x, This feature is OPTIONAL and is only 286# permitted in Armv8 implementations. 287ENABLE_SYS_REG_TRACE_FOR_NS ?= 0 288 289#---- 290# 8.2 291#---- 292 293# Build option to enable/disable the Statistical Profiling Extension, 294# keep it enabled by default for AArch64. 295ifeq (${ARCH},aarch64) 296 ENABLE_SPE_FOR_NS ?= 2 297else ifeq (${ARCH},aarch32) 298 ENABLE_SPE_FOR_NS := 0 299endif 300 301# Enable SVE for non-secure world by default. 302ifeq (${ARCH},aarch64) 303 ENABLE_SVE_FOR_NS ?= 2 304# SVE is only supported on AArch64 so disable it on AArch32. 305else ifeq (${ARCH},aarch32) 306 ENABLE_SVE_FOR_NS := 0 307endif 308 309#---- 310# 8.4 311#---- 312 313# Feature flags for supporting Activity monitor extensions. 314ENABLE_FEAT_AMU ?= 0 315ENABLE_AMU_AUXILIARY_COUNTERS ?= 0 316AMU_RESTRICT_COUNTERS ?= 1 317 318# Build option to enable MPAM for lower ELs. 319# Enabling it by default 320ifeq (${ARCH},aarch64) 321 ENABLE_FEAT_MPAM ?= 2 322else ifeq (${ARCH},aarch32) 323 ENABLE_FEAT_MPAM := 0 324endif 325 326# Include nested virtualization control (Armv8.4-NV) registers in cpu context. 327# This must be set to 1 if architecture implements Nested Virtualization 328# Extension and platform wants to use this feature in the Secure world. 329CTX_INCLUDE_NEVE_REGS ?= 0 330 331#---- 332# 8.5 333#---- 334 335# Flag to enable support for EL3 trapping of reads of the RNDR and RNDRRS 336# registers, by setting SCR_EL3.TRNDR. 337ENABLE_FEAT_RNG_TRAP ?= 0 338 339# Enable FEAT_MTE2. This must be set to 1 if the platform wants 340# to use this feature and is enabled at ELX. 341ENABLE_FEAT_MTE2 ?= 0 342 343#---- 344# 8.6 345#---- 346 347# Flag to enable AMUv1p1 extension. 348ENABLE_FEAT_AMUv1p1 ?= 0 349 350# Flag to enable delayed trapping of WFE instruction (FEAT_TWED). 351ENABLE_FEAT_TWED ?= 0 352 353# In v8.6+ platforms with delayed trapping of WFE being supported 354# via FEAT_TWED, this flag takes the delay value to be set in the 355# SCR_EL3.TWEDEL(4bit) field, when FEAT_TWED is implemented. 356# By default it takes 0, and need to be updated by the platforms. 357TWED_DELAY ?= 0 358 359# Disable MTPMU if FEAT_MTPMU is supported. 360DISABLE_MTPMU ?= 0 361 362# Flag to enable FEAT_FGT2 (Fine Granular Traps 2) 363ENABLE_FEAT_FGT2 ?= 0 364 365# LoadStore64Bytes extension using the ACCDATA_EL1 system register 366ENABLE_FEAT_LS64_ACCDATA ?= 0 367 368#---- 369# 8.8 370#---- 371 372# Flag to enable FEAT_THE (Translation Hardening Extension) 373ENABLE_FEAT_THE ?= 0 374 375#---- 376# 8.9 377#---- 378 379# Flag to enable access to Stage 2 Permission Indirection (FEAT_S2PIE). 380ENABLE_FEAT_S2PIE ?= 0 381 382# Flag to enable access to Stage 1 Permission Indirection (FEAT_S1PIE). 383ENABLE_FEAT_S1PIE ?= 0 384 385# Flag to enable access to Stage 2 Permission Overlay (FEAT_S2POE). 386ENABLE_FEAT_S2POE ?= 0 387 388# Flag to enable access to Stage 1 Permission Overlay (FEAT_S1POE). 389ENABLE_FEAT_S1POE ?= 0 390 391# Flag to enable access to Arm v8.9 Debug extension 392ENABLE_FEAT_DEBUGV8P9 ?= 0 393 394# AIE extension using the (A)MAIR2 system registers 395ENABLE_FEAT_AIE ?= 0 396 397# PFAR extension using the PFAR system registers 398ENABLE_FEAT_PFAR ?= 0 399 400#---- 401# 9.0 402#---- 403 404# Scalable Matrix Extension for non-secure world. 405ENABLE_SME_FOR_NS ?= 0 406 407# Scalable Vector Extension for secure world. 408ENABLE_SVE_FOR_SWD ?= 0 409 410# By default, disable access of trace buffer control registers from NS 411# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 412# if FEAT_TRBE is implemented. 413# Note FEAT_TRBE is only supported on AArch64 - therefore do not enable in 414# AArch32. 415ifeq (${ARCH},aarch64) 416 ENABLE_TRBE_FOR_NS ?= 0 417else ifeq (${ARCH},aarch32) 418 ifneq ($(or $(ENABLE_TRBE_FOR_NS),0),0) 419 $(error ENABLE_TRBE_FOR_NS is not supported for AArch32) 420 else 421 ENABLE_TRBE_FOR_NS := 0 422 endif 423endif 424 425# Flag that enables hardware injection of undefined exceptions 426ENABLE_FEAT_UINJ ?= 0 427 428#---- 429# 9.2 430#---- 431 432# Flag to enable Realm Management Extension (FEAT_RME). 433ENABLE_RME ?= 0 434 435# Scalable Matrix Extension version 2 for non-secure world. 436ENABLE_SME2_FOR_NS ?= 0 437 438# Scalable Matrix Extension for secure world. 439ENABLE_SME_FOR_SWD ?= 0 440 441# By default, disable access to branch record buffer control registers from NS 442# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 443# if FEAT_BRBE is implemented. 444ENABLE_BRBE_FOR_NS ?= 0 445 446# Flag to enable Floating point exception Mode Register Feature (FEAT_FPMR) 447ENABLE_FEAT_FPMR ?= 0 448 449# Flag to enable Memory Encryption Contexts (FEAT_MEC). 450ENABLE_FEAT_MEC ?= 0 451 452#---- 453# 9.3 454#---- 455# Flag to enable access to Arm v9.3 FEAT_D128 extension 456ENABLE_FEAT_D128 ?= 0 457 458# Flag to enable access to GICv5 CPU interface extension (FEAT_GCIE) 459ENABLE_FEAT_GCIE ?= 0 460 461# Enables access to PE-side MPAM bandwidth controls (FEAT_MPAM_PE_BW_CTRL) 462ENABLE_FEAT_MPAM_PE_BW_CTRL ?= 0 463 464# Flag to enable Exception-based Event Profiling (FEAT_EBEP) 465ENABLE_FEAT_EBEP ?= 0 466 467#---- 468#9.4 469#---- 470 471# Flag to enable FEAT_RME_GDI 472ENABLE_FEAT_RME_GDI ?= 0 473 474# Flag to enable access to Guarded Control Stack (FEAT_GCS). 475ENABLE_FEAT_GCS ?= 0 476 477# Flag to enable Fine Grained Write Traps (FEAT_FGWTE3) for EL3. 478ENABLE_FEAT_FGWTE3 ?= 0 479 480# Flag to enable checked pointer arithmetic (FEAT_CPA2) for EL3. 481# We don't have a flag for FEAT_CPA since that has no effect on software 482ENABLE_FEAT_CPA2 ?= 0 483 484#---- 485#9.6 486#---- 487 488# Flag to enable trapping of ID registers to EL3 489ENABLE_FEAT_IDTE3 ?= 0 490